<template>
  <div class="goods">
    <div class="menu-wrapper" v-el:menu-wrapper>
      <ul>
        <li v-for="item in goods" class="menu-item" :class="{'current':currentIndex === $index}" @click="selectMenu($index,$event)">
          <span class="text border-1px" >
            <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>{{item.name}}</span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" v-el:foods-wrapper>
      <ul>
        <li v-for="item in goods" class="food-list food-list-hook">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li @click="selectFood(food,$event)" v-for="food in item.foods" class="food-item border-1px">
              <div class="icon">
                <img :src="food.icon" height="57">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}</span><span>好评率{{food.rating}}</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span><span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol :food="food"></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shopcart v-ref:shopcart :select-foods="selectFoods" :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"></shopcart>
  </div>
  <food :food="selectedFood" v-ref:food ></food>
</template>

<script type="text/ecmascript-6">
  import BScroll from 'better-scroll';
  import shopcart from 'components/shopcart/shopcart';
  import cartcontrol from 'components/cartcontrol/cartcontrol';
  import food from 'components/food/food';

  const ERR_OK = 0;

  export default {
    props: {
      seller: Object
    },
    data () {
      return {
        goods: [],
        listHeight: [],
        scrolly: 0,
        selectedFood: {}
      };
    },
    computed: {
      currentIndex() {
        for (let i = 0; i < this.listHeight.length; i++) {
          let height = this.listHeight[i];
          let height2 = this.listHeight[i + 1];
          if (!height2 || (this.scrolly >= height && this.scrolly < height2)) {
            return i;
          }
        }
        return 0;
      },
      selectFoods() {
        let foods = [];
        this.goods.forEach((good) => {
          good.foods.forEach((food) => {
            if (food.count) {
              foods.push(food);
            }
          });
        });
        return foods;
      }
    },
    created () {
      this.classMap = ['decrease', 'discount', 'special', 'invoice', 'guarantee'];
      this.$http.get('/api/goods').then((response) => {
        response = response.body;
        if (response.errno === ERR_OK) {
          this.goods = response.data;
          this.$nextTick(() => {
            this._initScroll();
            this._calculateHeight();
          });
        }
      });
    },
    methods: {
      selectMenu(index, event) {
        if (!event._constructed) {
          // 去掉自带click事件的点击
          return;
        }
        let foodList = this.$els.foodsWrapper.getElementsByClassName('food-list-hook');
        let el = foodList[index];
        this.foodsScroll.scrollToElement(el, 300);
      },
      selectFood(food, event) {
        if (!event._constructed) {
          return;
        }
        this.selectedFood = food;
        this.$refs.food.show();
      },
      _drop(target) {
        // 体验优化 ，异步执行
        this.$nextTick(() => {
          this.$refs.shopcart.drop(target);
        });
      },
      _initScroll() {
        this.menuScroll = new BScroll(this.$els.menuWrapper, {
          click: true
        });
        this.foodsScroll = new BScroll(this.$els.foodsWrapper, {
          click: true,
          probeType: 3
        });
        this.foodsScroll.on('scroll', (pos) => {
          this.scrolly = Math.abs(Math.round(pos.y));
        });
      },
      _calculateHeight() {
        let foodList = this.$els.foodsWrapper.getElementsByClassName('food-list-hook');
        let height = 0;
        this.listHeight.push(height);
        for (let i = 0; i < foodList.length; i++) {
          let item = foodList[i];
          height += item.clientHeight;
          this.listHeight.push(height);
        }
      }
    },
    components: {
      shopcart,
      cartcontrol,
      food
    },
    events: {
      'cart.add'(target) {
        this._drop(target);
      }
    }
  };
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"

  .goods
    display :flex
    position :absolute
    top :174px
    bottom :46px
    width :100%
    overflow :hidden
    .menu-wrapper
      flex :0 0 80px
      width :80px
      background :#f3f5f7
      .menu-item
        display :table
        height :54px
        width :56px
        padding :0 12px
        line-height :14px
        &.current
          position :relative
          z-index :10
          margin-top :-1px
          background :#fff
          font-weight :700
          .text
            border-no()
        .icon
          display :inline-block
          vertical-align :top
          width :12px
          height :12px
          margin-right :2px
          background-size :12px 12px
          background-repeat :no-repeat
          &.decrease
            bg-image('decrease_3')
          &.discount
            bg-image('discount_3')
          &.guarantee
            bg-image('guarantee_3')
          &.invoice
            bg-image('invoice_3')
          &.special
            bg-image('special_3')
        .text
          display :table-cell
          width :16px
          vertical-align :middle
          border-1px(rgba(7,17,27,0.1))
          font-size :12px

    .foods-wrapper
      flex :1
      .title
        padding-left :14px
        height :26px
        line-height :26px
        border-left :2px solid #d9dde1
        font-size :12px
        color :rgb(147,153,159)
        background :#f3f5f7
      .food-item
        display :flex
        margin :18px
        padding-bottom :18px
        border-1px(rgba(7,17,27,0.1))
        &:last-child
          border-no()
          margin-bottom :0
        .icon
          flex :0 0 57px
          margin-right :10px
        .content
          flex :1
          .name
            margin :2px 0 8px 0
            height :14px
            line-height :14px
            font-size :14px
            color :rgb(7,17,27)
          .desc, .extra
            line-height :10px
            font-size :10px
            color :rgb(147,153,159)
          .desc
            line-height :12px
            margin-bottom :8px
          .extra
            .count
              margin-right :12px
          .price
            font-weight :700
            line-height :24px
            .now
              margin-right :8px
              font-size :14px
              color :rgb(240,20,20)
            .old
              text-decoration :line-through
              font-size :10px
              color :rgb(240,20,20)
          .cartcontrol-wrapper
            position :absolute
            right :0
            bottom :12px

</style>
